Skiving-knife.



A. LAT'HAM.

smvme KNIFE,

APPLICATiON FILED Til/(19,1916- LQ32A28, Patented July 3, 1917.

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ALBERT LA'lI-IAlVI, OF BEVERLY, MASSACHUSETTS, ASSIGNOB, T0 UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEVT JERSEY, A CORPORATION OF NEW JERSEY.

SKIVING-KNIFE.

To all whom it may concern:

Be it known that T, ALBERT LA'r AM, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in slaving- Knives; and I do hereby declare the following to be a full, clear, and exact'descr1ption of the invention such as will enable others skilled in the art to which 1t appertains to make and use the same.

The present invention relates to sk v ng knives, and more particularly to sk1v1ng knives of the type in which a thin knife blade is clamped to a tubular knife holder.

The object of the present invention is to provide a skiving knife of an improved type in which the knife blade may be conveniently adjusted with relation to the holder and is firmly clamped to the holder by a simple and efficient mechanism.

With this object in view, a feature of the invention contemplates the provision, in a knife of this type having a knife holder and a knife blade, of mechanism for clamplng the blade to the holder, comprising a clamping ring, a centrally disposed actuating member movable axially to operate the clamping ring, and connections between the actuating member and clamping rlng for causing the clamping ring to engage with the blade throughout the entlre perlpheral surface.

Still further features of the invention consist in certain novel features of construction, combinations and arrangements of parts thereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description.

In the accompanying drawings llustrating the preferred form of the inventlon, Figure 1 represents a section 1n elevation of the skiving knife taken upon the line 22 of Fig. 2; and Fig. 2 represents a front elevation, partly in section, of the skiving knife taken on the line 1 1, of Fig. 1.

In the present invention, the knife blade is conveniently clamped to the holder through the provision of a single actuating member which is manipulated by the operator to expand the clamping ring. Upon knife blade it may be ad usted with relation to the holder in the usual manner. In the illustrated embodiment of Specification of Letters Patent.

Patented July 3, 191?.

Serial No. 98,614.

the invention, the clamping ring is operated to engage with the knife blade through a series of radially disposed pins which operatively engage at their inner ends with the actuating member, and at their outer ends with an operating ring, which is adapted to engage with and move the clamping member. The opposite ends of the pins and cooperating faces of the actuating member and operating ring are inclined to cause an axial movement of the actuating member to impart radial outward movements to the pins and a corresponding axial movement in an opposite direction to the operating ring. The clamping ring is engaged in proximity to its outer periphery by a fixed head, which forms a fulcrum about which the ring is rocked by the pressure of the operating ring against the inner edge. The skiving knife comprises a substantially cylindrical knife holder 5 which is supported by a head 6, mounted upon the usual knife shaft 7. A knife blade 9 is supported within the holder upon a carrier 10, which is threadedly mounted upon a hub 12, secured to the head 6 through a plurality of clamping bolts'll. The knife holder 5 is locked against rotation relative to the carrier 10 by a series of studs 15 threadedly secured in the holder and received in apertures formed in the carrier and of sufficient length to form guiding members for the carrier during the relative movements of the carrier .and knife holder. The knife blade is secured to the carrier adjacent its inner edge in the usual manner, and is conveniently adjusted relative to the holder by relatively rotating the holder 5 and knife shaft 7. It will be observed that in the present construction the holder is journaled upon the hub 12, and by retaining the holder stationary and rotating the knife shaft, the hub 12 will be rotated to move the carrier 10 in an axial direction.

The knife blade is conveniently clamped to the holder by an internal clamping member which is operated by a single centrally disposed actuating member arranged conveniently to the operator. To this end, an annular clamping ring 20 is arranged with its outer periphery supported in proximity. to the inner surface of the knife blade, and is engaged adjacent its inner edge by an operating ring 22, slidingly supported in the hub 12. The operating ring is moved axially and serves to rock the clamping ring .site direction to the ring 22.

about the edge of a cup-shaped head 23 having a hub 2st on which the clamping ring 20'is loosely supported. The operating ring 22 is moved axially to press the clamping ring against the knife blade by a series of sliding pins 26 supported radially in re cesses formed in the hub 12, and arranged to engage with the operating ring at a plurality of points equidistant from one another. The pins 26 are operatively con nected at their inner ends with an actuating member 28, supported concentrically with relation to the pins. The inner face 29 of the actuating member and the inner ends of the pins cooperating therewith are tapered, as shown clearly in; Fig. 1, and the outer ends of the'pins and cooperating. face of the ring 22 are tapered in the opposite direction to cause an axial movement of the member 28 to impart a like movement in the oppo- The head 23 is clamped in position upon the hub 12 by a retaining member 30, threadedly secured in the hub and having a flange 31 which engages with a corresponding annular recess formed in the hub 2%]: to clamp the two members 12 and 24: together. The actuating member 28 is conveniently received in aninternally threaded bore formed in the member 30, and is provided with a transverse slot 32 for the reception of an operating tool.- With this construction, upon rotating the actuating member to move the member inwardly, the pins 26 are moved outwardly in radial directions, causing an axial move ment of the ring 22 intoengagement with the inner edge of the clamping ring 20. The pressure thus exerted against the inner edge of the clamping ring causes the ring to fulcrum about the periphery of the head 23 and firmly clamp the knife blade to the holder throughout all portions of the periphery. In order to facilitate the clamping action of the ring 20, it is conveniently provided with a series of radially disposed slots 34:, as shown clearly in Fig; 2.

It will be obvious that the clamping ring will tend to exert a relative rotation of the knife holder and knife shaft. In order to effectually prevent a rotation of the two members after the knife blade has been adj'u'sted and clamped in position, however, mechanism is provided for firmly clamping the knife holder to the hub 12;. To this end, a ring 35 is supported in the hub 12 and is provided with a series of studs 37, the ends of which engage with the inner face of the holder 5. In order to cause the studs to engage with and clamp the knife holder when the clamping ring 20' is actuated, the

inner face of the ring 35 is slightly tapered and is adapted to be engaged by a corre: spondingly tapered face 38 formed upon each of the sliding pins 26, opposite the tapered face of the pin which engages with thering 22. WVith this construction, when the pins are moved outwardly they serve to actuate both of the rings-22 and 35in opposite directions. In order to permit the pins to properly actuate both of the rings, each pin is loosely supported in the corresponding radial slot formed in the hub 12 and has provision for a slight lateral movement. WVith this construction the pins, moving outw'ardly, first cause the ring 35 to assume a clamping position and thereafter the faces of the pins engaging: with the ring may be moved laterally in addition to the radial movement to operate the clamping ring 20.

While it is preferred to employ the specific construction and arrangement of parts shown and described, it will be understood that this COIlStFUCtlOIl and arrangement is not essential exceptso far as Sp6ClfiGCl 1Ilthe claims, and may be changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is: t I

1. A skiving knife, having,in combination, a knife holder,;a knife blade, a: clamping ring adapted to clamp the blade to the holder, a centrally disposed actuating mem ber movable axially to operate the clamping ring, and operative connections between: the actuating member and clamping ring, including a plurality of radially disposed plns.

2. A skivingv knife,-having,in combination, aknife holder, a knife blade, a clamping ring supported within the knife blade, an actuating member, and a series of radially disposed pins operatively connected at op 'posite ends with the actuating memberand the clamping ring and arranged to operate the clamping ringupon an axial movement of the actuating member.

3. A skiving knife, having, in combination, a knife holder, a knife blade, a clamping ring supported within the blade, an operating ring engaging with the clamping ring adjacent its inner edge,- a centrally disposed actuating member, and operative connections between the actuating member" and the holder, a clamping ring, a series of pins positioned radially in the hub and having inclined inner ends, an actuating member having an inclined face engaging with the inner ends of the pins, and operative connections between the outer ends of the pins and the clamping ring.

6. A skiving knife, having, in combination, a hub, a knife holder supported upon the hub, a knife blade, a clamping ring, means for clamping the knife holder to the hub, and a single actuating member arranged to operate the clamping ring and the means for clamping the knife holder.

7. A skiving knife, having, in combination, a hub, a knife holder supported upon the hub, a knife blade, and mechanism comprising a single actuating member for clamping the knife holder to the hub and for clamping the blade to the holder.

8. A skiving knife, having, in combination, a hub, a knife holder supported upon the hub, a knife blade, a clamping ring for the knife blade, an operating ring supported in the hub, a knife holder clamping ring, a series of radially disposed pins engaging with the operating ring and knife holder clamping ring, and means for actuating the pins to operate both of the rings to clamp the knife blade to the holder and the knife holder to the hub.

9. A skiving knife, having, in combination, a knife holder, a knife blade, a clamping ring, an operating ring engaging with the clamping ring adjacent its inner edge and having an inclined face, a series of radially disposed pins having inclined outer ends engaging with the inclined face of the operating ring and inner ends inclined in the opposite direction, and an actuating member having an inclined face engaging with the inner ends of the pins.

10. A skiving knife, having, in combination, a knife holder, a knife blade, a clamping ring, a retaining head for the ring, a centrally disposed member for retaining the head in position having an internally threaded bore, an actuating member threaded in the bore, and operative connections between the actuating member and clamping ring.

11. A skiving knife, having, in combination, a knife holder, a knife blade, a clamping ring, a series of radially disposed pins, a pair of oppositely disposed rings engaging with theouter ends of the pins, and means for moving the pins to separate the rings.

12. A skiving knife, having, in combina tion, a hub, a knife holder supported upon the hub, a knife blade, a clamping ring, a series of pins sliding in a lengthwise direction in the hub and having provision for lateral movement, a pair of rings supported in the hub and engaging with opposite sides of the pins, and means for actuating the pins to separate the rings.

ALBERT LATI-IAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

